﻿using System;

class FactorialMultiplication
{
    static void Main()
    {
        decimal nFactorial = 1;
        decimal kFactorial = 1;
        decimal knFactorial = 1; // (K-N)! --> (15 -10)!
        decimal result = 0;
        for (int i = 10; i > 1; i--)
        {
            nFactorial *= i;
        }
        for (int i = 15; i > 1; i--)
        {
            kFactorial *= i;
        }
        for (int i = 5; i > 1; i--)
        {
            knFactorial *= i;
        }
        result = (nFactorial * kFactorial) / knFactorial;
        Console.WriteLine("(N!*K!)/(K-N)! --> {0}*{1}/{2} = {3}", nFactorial, kFactorial, knFactorial, result);
    }
}
